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Proc Natl Acad Sci U S A. 1995 Apr 11;92(8):3086-90.

Pex1, a pollen-specific gene with an extensin-like domain.

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  • 1Biology Department, University of North Carolina, Chapel Hill 27599-3280, USA.


We report here the identification of a pollen-specific gene from Zea mays that contains multiple Ser-(Pro)n repeats, the motif found in the cell wall-associated extensins. Sequence analysis reveals that the encoded protein has a putative globular domain at the N terminus and an extensin-like domain at the C terminus. The Pex1 (pollen extensin-like) gene is expressed exclusively in pollen, not in vegetative or female tissues, and is not induced in leaves upon wounding. We propose that the encoded protein may have a role in reproduction, either as a structural element deposited in the pollen tube wall during its rapid growth or as a sexual recognition molecule that interacts with partner molecules in the pistil.

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